To register on forum please run LGtool sw, go to Support tab, press "Go to support" button then click on "Profile" link.
If your card is not registered then register it first. With registered card you can create forum account there.
For more info please read this manual.

I don't know if i have reseller account but still i was about to try the above method of transferring credits to working account but the password i created to sales doesn't let me login and default login password 123 also doesn't work.

Press OK and type a number of credits pack to be transferred. (example if you want to transfer 500 you should write 5 x 100).
Press Sale. Than OK in confirmation window. If procedure performed correctly you will see this.